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(I originally posted this in the main PHP manual some time in early 2002 and an article outlining this amongst other things may soon circulate somewhere on u- magazine.com or elsewhere.) I used some help from the web as far as the javascript element goes, but the rest is my own strange reasoning. I learned everything the hard way when moving to a server that was out of our time zone, and discovered that all of the posts in our message board were three hours behind us. I also got in a bit of an argument with one of the main PHP.net guys about why "simple" things like this should be more important than functions like Output Buffering. Anyhow, <? //first lets introduce the main page displaying the local-to-user date and time. As //I was working on forums scripts, lets call this forums.php the way our forums are //constructed is that all the programming is done, then the layout is compiled and //parsed in one giant template, which is very fast. //This is part of the programming before the page template is parsed. If the user //time zone cookie hasn't been set (on the first visit to a page, it won't have //been), open the javascript include that will appear in the page's template : if(!$usertimezone){ // special amendment for date/time conversion // open javascript template/include $checktimezone=parsetemplate("checktimezone"); // this javascript looks like this: /* <script type="text/javascript"> now = new Date(); window.location.href="$PHP_SELF?tz=" + now.getTimezoneOffset(); </script> */ // somebody else created the script above. It makes sense though, on the first visit // to the page, it automatically redirects to the same page, with the time zone // variable ("tz") passed through the URL. }elseif($tz){ // the next time a page in the forums has been accessed, and the cookie has not yet // been set, set a cookie with the user's time zone (from GMT) AND create a variable // for the time zone, because data in a cookie won't be seen until the next header // request, and you want everything to take effect NOW. $usertimezone=$tz; setcookie("usertimezone",$usertimezone); } // next page is your functions page // user date/time with local time zone function userdate($format,$timestring){ // declare globals (that being the cookie and variable you have set) global $usertimezone; // convert user time zone into seconds $timezone=$usertimezone*60; // find timezone difference between server and UST in seconds $difference=date("Z"); // difference between user and server $usertime=$timestring-$difference-$timezone; // return new value return(date($format,$usertime)); } // end user date/time // then, when you want to display the date and time local to the user, you call it // like this, just like you would a normal "date()" function, but allowing for the // new function you have just created (assuming you used a time() string for your // date): $posttime = userdate($your_date_format,$time_of_post); // I'm not sure why there isn't some way to read the time/date headers in a page // request from the user's browser like you do with everything else in the language, // compare that to the server's time, and exclude client-side programming // altogether. If you can figure out a user's IP address, browser type and credit // card number, you can certainly figure out the difference between their time and // the server's. // I have been using this date/time setup for a couple of months now, and to be // honest, I had forgotten we even used it. This is a good thing, because at first I // assumed it would all be a bit too distracting or annoying, but I was far wrong. | |||||
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